Run a full write-and-verify test on the completely empty SD card.

“Trying to install Mario Kart 7 DLC CIA on New 3DS XL, Luma 13.0, FBI 2.6.0. Error 0xD8E0806A.”

If you're using a cheap or failing SD card, the very act of writing a file to it can corrupt the data. An error may occur while saving or copying the .CIA file onto the card, leading to a corrupted file.

Complete Guide to Fixing 3DS Error Code 0xd8e0806a The error code is a common and frustrating issue encountered by Nintendo 3DS custom firmware (CFW) users. It typically occurs when using FBI (the open-source CIA installer) to install game backups, updates, or homebrew applications.

AM (32) — This refers to the Application Manager responsible for installing titles.

: A partial or unstable download often causes this specific hash check error. Try a different source like the hShop or use a more stable internet connection. Check/Format SD Card : Run chkdsk on your computer to scan the SD card for errors.

: The most frequent cause is a file that was incompletely downloaded or corrupted during transfer

Does this error happen with or just one specific file ? What is the storage size of your SD card?

: Some CIA files are dumped specifically for the original owner's console and contain unique "tickets" that don't work on other systems

3dstool -x -f cia -t cia suspect.cia -o extracted/

If files keep corrupting, your SD card might have corrupted sectors. Plug your SD card into a computer.

If your title database is corrupted, FBI cannot register the newly installed CIA. Fixing this is safe and often resolves error 0xd8e0806a.